package cc.autoapi.pucong.auto.flow.core.root.utils;

import lombok.extern.slf4j.Slf4j;

import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

/**
 * 解压文件工具类
 *
 * @author pzy
 * @version 0.1.0
 * @description TODO
 */
@Slf4j
public class ZipUtil {
    /**
     * 解压核心功能
     *
     * @param zipFilePath 文件目标路径
     * @param destDir     文件解压后路径
     * @throws IOException
     */
    public static void unzip(String zipFilePath, String destDir) throws IOException {

        log.info("===>开启文件解压: {}", zipFilePath);
        File dir = new File(destDir);
        if (!dir.exists()) {
            boolean mkdirs = dir.mkdirs();
            if (!mkdirs) {
                log.error("多级文件夹创建失败===>{}", destDir);
            }
        }
        //windows下中文默认gbk 正常使用utf-8
        try (ZipInputStream zipIn = new ZipInputStream(new FileInputStream(zipFilePath), StandardCharsets.UTF_8)) {
            ZipEntry entry = zipIn.getNextEntry();
            while (entry != null) {
                String filePath = destDir + File.separator + entry.getName();
                if (!entry.isDirectory()) {
                    extractFile(zipIn, filePath);
                } else {
                    File dirToCreate = new File(filePath);
                    boolean mkdirs = dirToCreate.mkdirs();
                    if (!mkdirs) {
                        log.error("多级文件夹创建失败===>{}", filePath);
                    }

                }
                zipIn.closeEntry();
                entry = zipIn.getNextEntry();
            }
        }
    }

    /**
     * 提取文件
     *
     * @param zipIn    ZipInputStream
     * @param filePath 文件路径
     * @throws IOException
     */
    private static void extractFile(ZipInputStream zipIn, String filePath) throws IOException {
        try (FileOutputStream fos = new FileOutputStream(filePath)) {
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = zipIn.read(buffer)) != -1) {
                fos.write(buffer, 0, bytesRead);
            }
        }
    }

    private static final int BUFFER_SIZE = 2 * 1024;

    /**
     * 压缩成ZIP 方法1
     *
     * @param srcDir           压缩文件夹路径
     * @param out              压缩文件输出流
     * @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;
     *                         false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
     * @throws RuntimeException 压缩失败会抛出运行时异常
     */
    public static void toZip(String srcDir, OutputStream out, boolean KeepDirStructure) throws RuntimeException {
        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out, Charset.forName("gbk"));
            File sourceFile = new File(srcDir);
            compress(sourceFile, zos, sourceFile.getName(), KeepDirStructure);
            long end = System.currentTimeMillis();
            log.info("压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {

                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 目录和文件压缩
     *
     * @param srcDir
     * @param KeepDirStructure
     * @return
     * @throws RuntimeException
     */
    public static String toZip(String srcDir, boolean KeepDirStructure) throws RuntimeException {
        // 压缩文件路径
        String zipFilePath = getTmpPath() + File.separator + UUID.uuid() + ".zip";
        File file = new File(zipFilePath);
        if (!file.exists()) {
            File parentFile = file.getParentFile();
            parentFile.mkdirs();
            try {
                file.createNewFile();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        try (FileOutputStream fileOutputStream = new FileOutputStream(zipFilePath)
        ) {
            toZip(srcDir, fileOutputStream, KeepDirStructure);
        } catch (Exception e) {
            log.error("压缩失败", e);
        }
        return zipFilePath;
    }

    private static String getTmpPath() {
        String usrdir = System.getProperty("user.dir");
        String basePath = usrdir + File.separator + "data" + File.separator + "tmp";

        File file = new File(basePath);
        if (!file.getParentFile().exists()) {
            file.getParentFile().mkdirs();
        }
        if (!file.exists()) {
            file.mkdirs();
        }
        return basePath;
    }

    /**
     * 多文件压缩
     *
     * @param srcFiles
     * @return
     * @throws RuntimeException
     */
    public static String toZip(List<String> srcFiles) throws RuntimeException {
        // 压缩文件路径
        String zipFilePath = getTmpPath() + File.separator + UUID.uuid() + ".zip";
        File file = new File(zipFilePath);
        if (!file.exists()) {
            File parentFile = file.getParentFile();
            parentFile.mkdirs();
            try {
                file.createNewFile();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        try (FileOutputStream fileOutputStream = new FileOutputStream(zipFilePath)
        ) {
            toZip(srcFiles, fileOutputStream);
        } catch (Exception e) {
            log.error("压缩失败", e);
        }
        return zipFilePath;
    }

    /**
     * 压缩成ZIP 方法2
     *
     * @param srcFiles 需要压缩的文件列表
     * @param out      压缩文件输出流
     * @throws RuntimeException 压缩失败会抛出运行时异常
     */
    public static void toZip(List<String> srcFiles, OutputStream out) throws RuntimeException {
        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out, Charset.forName("gbk"));
            for (String path : srcFiles) {
                File srcFile = new File(path);
                byte[] buf = new byte[BUFFER_SIZE];
                zos.putNextEntry(new ZipEntry(srcFile.getName()));
                int len;
                FileInputStream in = new FileInputStream(srcFile);
                while ((len = in.read(buf)) != -1) {
                    zos.write(buf, 0, len);
                }
                zos.closeEntry();
                in.close();
            }
            long end = System.currentTimeMillis();
            log.info("压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 递归压缩方法
     *
     * @param sourceFile       源文件
     * @param zos              zip输出流
     * @param name             压缩后的名称
     * @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;
     *                         false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
     * @throws Exception
     */
    private static void compress(File sourceFile, ZipOutputStream zos, String name,
                                 boolean KeepDirStructure) throws Exception {
        byte[] buf = new byte[BUFFER_SIZE];
        if (sourceFile.isFile()) {
            // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
            zos.putNextEntry(new ZipEntry(name));
            // copy文件到zip输出流中
            int len;
            FileInputStream in = new FileInputStream(sourceFile);
            while ((len = in.read(buf)) != -1) {
                zos.write(buf, 0, len);
            }
            // Complete the entry
            zos.closeEntry();
            in.close();
        } else {
            File[] listFiles = sourceFile.listFiles();
            if (listFiles == null || listFiles.length == 0) {
                // 需要保留原来的文件结构时,需要对空文件夹进行处理
                if (KeepDirStructure) {
                    // 空文件夹的处理
                    zos.putNextEntry(new ZipEntry(name + "/"));
                    // 没有文件，不需要文件的copy
                    zos.closeEntry();
                }

            } else {
                for (File file : listFiles) {
                    // 判断是否需要保留原来的文件结构
                    if (KeepDirStructure) {
                        // 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
                        // 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
                        compress(file, zos, name + "/" + file.getName(), KeepDirStructure);
                    } else {
                        compress(file, zos, file.getName(), KeepDirStructure);
                    }
                }
            }
        }
    }
}

